Lesson 2 - DoorProject - why is DoorSensor AutoCloseable

Question

In the provided solution the DoorSensor class implements AutoCloseable. Is there any reason for implementing this interface?
The close() method can be implemented without AutoCloseable interface in class declaration.

Answer 1

Hi -
try-with-resources is a type of try statement where there is an assignment in the start of the try block:
try (InputStream is = new InputStream(...)) {
  //  Notice there is no "close" and no "finally"
} catch (IOException ex) {
This language enhancement was introduced in Java SE 7 (and is now part of Java ME Embedded 8).
More on try-with-resources in the Java Tutorials.
Tom